Mobile Software Engineer at founder-led climate tech startup

Join the UK's largest reusable packaging provider and help eliminate the 10.7 billion items of packaging waste generated annually. Led by a Forbes 30 Under 30 founder, this climate tech startup is looking for a Mobile Engineer to own their Kotlin Multiplatform migration and build the IoT-driven infrastructure that makes reuse as easy as throwaway. With 1.6 million pieces of waste already prevented and major clients like the NHS and BT on board, you'll join an ambitious team where your code has a measurable environmental impact and you'll receive meaningful early-stage equity.

Overview

Role overview

Join a mission-driven team replacing single-use packaging with IoT and AI technology. You will lead mobile engineering efforts, owning the migration to Kotlin Multiplatform while shipping features that have already prevented 1.6 million pieces of waste. This is a high-impact role working directly with the technical lead to build sustainable infrastructure.

Company

Cauli

Climate Technology / Manufacturing

Founder-led climate tech startup and the UK's largest reusable packaging provider for the food service industry

Responsibilities

What you will do

Lead the development and maintenance of consumer and client-facing applications, specifically driving the transition from native apps to a unified KMP architecture.
Build and integrate lightweight web applications with digital wallets to streamline container tracking and improve the user experience for reuse.
Collaborate across the stack by contributing to PHP/Laravel backend services and occasionally supporting Python-based software on Linux smart bin hardware.

Candidate profile

Who this is a fit for

1-2 years of professional mobile experience with production-level Kotlin skills and a strong foundation in native Android development.
Practical experience or deep technical enthusiasm for Kotlin Multiplatform (KMP), with the ability to manage iOS frameworks and SwiftUI integrations.
A versatile, startup-ready mindset comfortable exploring REST APIs, PHP, or Python to solve problems across the entire product ecosystem.

What makes it remarkable

Why this role is remarkable

Work at the forefront of sustainability with a Forbes 30 Under 30 founder on a product that has already scaled to 50+ sites and major enterprise clients like BT and the NHS.
Gain true ownership of the mobile roadmap, including a complete migration to a unified Kotlin Multiplatform codebase and integration with Apple/Google Wallets.
Receive meaningful early-stage equity in a fast-growing startup where your engineering decisions directly reduce environmental waste at a massive scale.

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